How to identify new records in a table using OBIEE

Hi,
I have price change table as and when a record comes into this table i have to generate an alert. Then show a report with the price changes on which i can invoke an action to go into my transactional system to make the chnage. And once the change is made the process again starts to look for any new price chnage records that are recieved.
Could anyone pls tell me how to identify new records in a table.
Rgds

SELECT ID, LastName, FirstName,
RANK() OVER (PARTITION BY LastName,
FirstName ORDER BY ID) AS SeqNumber
FROM
(SELECT ID, LastName, FirstName
FROM Customers
WHERE (LastName, FirstName) IN
(SELECT LastName, FirstName
FROM Customers
GROUP BY LastName, FirstName
HAVING COUNT(*) > 1)

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